package chapter04.example17;
class Animal{
    public void shout(){
        System.out.println("动物叫....");
    }
}
class Dog extends Animal {
    public void shout(){
        System.out.println("汪汪汪.....");
    }
    public void eat(){
        System.out.println("吃骨头.....");
    }
}
public class example17 {
    public static void main(String[] args) {
        Animal a1 = new Dog();
        System.out.println("instanceof判断a1是否来自动物类"+(a1 instanceof Animal));
        System.out.println("instanceof判断a1是否来自狗类"+(a1 instanceof Dog));
        Animal a2 = new Dog();
        System.out.println("instanceof判断a2是否来自动物类"+(a2 instanceof Animal));
        System.out.println("instanceof判断a2是否来自狗类"+(a2 instanceof Dog));
    }
}
